15-Pound, Retro-Tech Flywheel Helps You Pedal Your Bike To Tomorrow

The technology of a flywheel is simple and old: Use energy to spin up a wheel very quickly. Later, you can take that spinning energy and use it for something else. But you normally think of flywheels as enormous steel monstrosities spinning in factories. When braking, the biker simply shifts gears and allows the energy to transfer from the back wheel to the flywheel (instead of transferring uselessly to the brake pads). The wheel weighs 15 pounds, so you certainly need the extra help it provides to keep moving. / 10 Pin / 29 Plus / 50 Tweet / 602 Like / 13 Share

How Products Are Made Chapter 5 : Repeating Decimals 1/81 = 0.012345679 ... (from 0 to 7 (one letter), last is 9. length=9) 1/891 = 0.001122334455667789 ... (from 00 to 77 (two letters), last is 89. length=18) 1/8991 = 0.000111222333444555666777889 ... Power of n Power of 2 appears. At a first glance, the pattern corrupts at 65, but so the pattern continues eternaly. [general formula] For power of "a" in k-digits, a/(10^k-a) In case of 11, This is, so the expansion becomes Fibonacci number. Multiple Using gereration function. s = kx + 2kx^2 + 3kx^3 + 4kx^4 + ... = k(x + 2x^2 + 3x^3 + 4x^4 ...) So, start from s = x + 2x^2 + 3x^3 + 4x^4 ... sx = x^2 + 2x^3 + 3x^4 + 4x^5 ... ∴ (1-x)s = x + x^2 + x^3 + ... The right side is a geometric series which first term is x and ratio is x, so, = x/(1-x) ∴ s = x/(1-x)^2 Let x replace by 1/x then, s = x/(x-1)^2 General formula is, 2 digits : k*100/99^2 3 digits : k*1000/999^2 4 digits : k*10000/9999^2 ... We can transform this for unit fraction, if we don't adhere to the start of first digit, In case of multiple of 7,

Roman Numerals The Romans were active in trade and commerce, and from the time of learning to write they needed a way to indicate numbers. The system they developed lasted many centuries, and still sees some specialized use today. Roman numerals traditionally indicate the order of rulers or ships who share the same name (i.e. Queen Elizabeth II).